The National Council of Resistance of Iran (NCRI), an exiled Iranian opposition group, claims that Iran is completing several secret nuclear sites as part of a parallel, undeclared nuclear program. According to the NCRI, one of these sites is a 600-meter tunnel complex built under a mountain within the Haft-e Tir military facility near the town of Mobarekeh.  Work on the complex, which is reportedly managed by the Organization of Defensive Innovation and Research, began in 2005 and was recently concluded.